Derrick.



'FE!-J ZENT ED SEPT. 8, 1908.

P. YORKB, DERRICK.

APPLiGATION FILED JAN. 23, 1908.

jiifa rzzgz PATRICK YORKE, OF WASHINGTON, PENNSYLVANIA.

DERRICK.

Application filed January 23, 1908. Serial'No.

Specification of Letters Patent.

Patented Sept. 8, 1908.

T 0 all whom it may concern:

Be it known that I, PATRICK Youku, a citizen of the United States, residing at Washington, in the county of \Yashinglon and State of Pennsylvania, have invented a certain new and useful Improvement in Derricks; and I do hereby declare the following to be a full, clear, and exact description of my invention, such as will enable others skilled in the art to which it appcrtains to construct and use the same.

Hy invention relates to derricks and particularly to der'ricks constructed of wood, for oil, gas and Artesian wells, and consists in certain novel features anddetails of construction as will be more fully described hereinafter and finally pointed out in the claim.-

This invention constitutes an improvement over my former patents Nos. 852,486 and 877,624 issued May 7th, 1907 and January 28th, 1908 res )ectively.

I will now. describe my inventionreference being bad to the accompanying drawings, in which similar letters of reference .indicate c'orrespomling parts in the different figures, and in which,

Figure 1, is a side elevation of a derrick constructed in accordance with my improvements. Fig. 2 is a side elevation of one of the joints or sections in detail. Fig. 3, is a detail view of the yoke employed. Fig. 4, is a detail plan view of the yol' e-plate. Fig 5, is a side elevation of one of the section plates, and Fig. '6, is aside elevation of the section plate which is placed at right angles to that shown in Fi 5, at the same joint.

I will nowdcseribe my invention which is as follows:

The corner posts or uprights of the derrick are madein several sections A, as in my former patents above referred to, but instead of bein secured together by means of lates and olts which passed through holes ored in the timbers, I now use only two plates at each joint, both of which are placed on the outside of the corner uprights at right angles to each other, andinstead of boring the timhers and bolting thev lates on as heretofore, I have constructed di erent shaped plates as best shown in Figs. 5 and 6, which are provided with ears or lugs a, on the sides, with holes therein, andalso a series of holes in the tongue thereof, the purpose of which is to form projections which extend out past the edges of the uprights for receivin clamps or yokes, as will be more fully described-hereinafter.

In constructing a derrick after the present invention, the base or bottom timbers B, are put into place and are held by means' of angle-irons placed. on the top and bottom thereof and secured by clamps or yokes b. The first section of the corner posts or uprights are then raised and clamped in place by means of an.gleirons c, and yokes I), and d. T-irons e, are then clamped on to the corners of these upright-s, near their to s by means of yokes f, and g, and'the girths 1, are then put into place and clamped by means of yokes 1.

The second section of the uprights arethen 'raised and-clamped by means of the yokes j;

and T-irons a, secured to the tops thereof the same as in the first-section; this same construction being carried out at each joint or section of the derrick until the desired height is attained. Braces k, are raised into place and the ends thereof crossed and slipped under the yokes and are rigidly clamped and held in position thereby.

By the present construction, it will be seen that a very rigid derrick may be constructed without the use of nails, bolts or screws, or the necessity ofboring holes, as was the case in my former inventions, thereby doing away with a great deal of labor and unnecessary ex ense inklerrick construction.

Iaving described my invention, what I claim and desire to secure by Letters Patent 1s-- A derrick for oil, gas and Artesian wells, constructed of several sections which together with the girths and braces are ri idly secured and held in position by means 0 angle and T-irons and yokes which embrace said parts forming clamping devices therefor, all substantially as shown and described.

In testimony that I claim the foregoing as my own invention, I have hereunto set my hand in the presence of two witnesses.

' PATRICK YORKE.

Witnesses: v

BLANCHARI) (l. IIvoims. II. B. lIUouus 

